The method involves exposing a part of an incompletely hardenable pixel (21) using an amount of energy below a hardening-threshold value (Eth). A radiation is produced on a photosensitive layer (19) attached on a carrier substrate such that maximum energy density of a radiation, which is irradiated on the photosensitive layer for exposing the incompletely hardenable pixel, lies below the incompletely hardenable pixel. A part of the latter radiation is allowed to lie outside the incompletely hardenable pixel and within a completely hardenable pixel (20).